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A couple of days ago, Epic accidentally enabled cross-platform play between Xbox One and PlayStation 4 players of Fortnite. Sadly, it seems as though this was done by mistake and Epic had to Here is a first-hand account from a user named PRE_-CISION-_ on Reddit.
Another Reddit user confirmed that he and his son were indeed playing on different platforms together at the same time (pictured above).
Just let it be known that enabling cross-platform play between the Xbox and PlayStation is literally as easy as a "configuration issue." Yep, right now the only thing continuing to prevent this from being a permanent thing is Sony.
(via Kotaku)
It's probably the reason Rocket League has so readily enabled it, and how SF5 is able to do it considering it's not something Capcom has done before.